Mechanical properties of seamless steel pipe
2021-10-19 11:03:40 COMMENT：0 HITS：
The mechanical property of seamless steel pipe is an important index to ensure the final service performance (mechanical property) of steel, which depends on the chemical composition and heat treatment system of steel.
In the steel pipe standard, according to different service requirements, the tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness indexes, as well as the high and low temperature properties required by users are specified.
① Tensile strength（ σ b）
The maximum force (FB) borne by the specimen during tension, divided by the original cross-sectional area (so) of the specimen（ σ）， Called tensile strength（ σ b) , in N / mm2 (MPA). It represents the maximum resistance of metal materials to failure under tensile force. The calculation formula is: where: FB -- the maximum force borne by the sample when it is broken, n (Newton); so -- the original cross-sectional area of the sample, mm2.
② Yield point（ σ s）
For metal materials with yield phenomenon, the stress when the specimen can continue to elongate without increasing (keeping constant) the stress during the tensile process is called the yield point. If the stress decreases, the upper and lower yield points shall be distinguished. The unit of yield point is n / mm2 (MPA).
Upper yield point（ σ Su): the maximum stress before the yield stress of the sample decreases for the first time; the lower yield point（ σ SL): the minimum stress in the yield stage when the initial instantaneous effect is not considered.
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